Wifi Manager Plus+* - Automatically takes in your Wifi hotspot areas.
* - Turns Wifi off when detached from Wifi system.
* - Automatically turns Wifi on when close to a known hotspot

Tetherbot (Android)Tetherbot is an experimental SOCKS proxy and Port Bouncer that should allow you to connect your laptop to the internet using the internet connection (EDGE, 3G or WiFi) of your Android-powered phone